How to make it

Preheat oven to 350°F. Line a 9x9 inch square pan with alluminium foil. Lightly grease the foil with cooking spry.

Cream together the butter with the peanut butter until smooth. Add the sugar and beat until light and fluffy. Add the eggs, one at a time.

Sift together the potato starch with the cocoa powder, the baking powder and the salt.

Stir in the butter cream until just combined. Add the chocolate chips and the walnuts (peanuts). Scrape batter in the prepared pan. Bake about 30 minutes in the preheated oven. Cool brownies on a wire rack about 10 minutes. Then slice.